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LED DRIVER. IS31LT3380 Datasheet

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LED DRIVER. IS31LT3380 Datasheet






IS31LT3380 DRIVER. Datasheet pdf. Equivalent




IS31LT3380 DRIVER. Datasheet pdf. Equivalent





Part

IS31LT3380

Description

40V/1.2A LED DRIVER



Feature


IS31LT3380 40V/1.2A LED DRIVER WITH SWIT CH DIMMING OCTOBER 2011 GENERAL DESCRI PTION The IS31LT3380 is a continuous mo de inductive step-down converter, desig ned for driving a single LED or multipl e series connected LEDs efficiently fro m a voltage source higher than the LED voltage. The chip operates from an inpu t voltage between 8.5V and 40V and prov ides an output cur.
Manufacture

ISSI

Datasheet
Download IS31LT3380 Datasheet


ISSI IS31LT3380

IS31LT3380; rent up to 1.2A. The IS31LT3380 includes a high-side output current sensing cir cuit, which uses an external resistor t o set the nominal average output curren t. The IS31LT3380 includes an integrate d output switch which has a very low co nducting impedance to ensure high syste m efficiency. The IS31LT3380 has switch dimming function. The chip detects ext ernal switch actio.


ISSI IS31LT3380

n to adjust output current, allowing for dimming functionality to be achieved w ithout changing the original lighting s ystem circuitry. The switch dimming is implemented in either two-level mode or three-level mode. The output current o f every level and the total number of l evels are customer selected by setting the corresponding input conditions of D IM1 and DIM2 pin. .


ISSI IS31LT3380

The output current is set at the initial value the first time that power is sup plied to the chip. After the initial po wer up sequence, the chip adjusts the o utput current according to the external switch action. After the lowest curren t level, the current cycles back to the initial value if more switch action is detected. If the power is switched off for longer than 2.

Part

IS31LT3380

Description

40V/1.2A LED DRIVER



Feature


IS31LT3380 40V/1.2A LED DRIVER WITH SWIT CH DIMMING OCTOBER 2011 GENERAL DESCRI PTION The IS31LT3380 is a continuous mo de inductive step-down converter, desig ned for driving a single LED or multipl e series connected LEDs efficiently fro m a voltage source higher than the LED voltage. The chip operates from an inpu t voltage between 8.5V and 40V and prov ides an output cur.
Manufacture

ISSI

Datasheet
Download IS31LT3380 Datasheet




 IS31LT3380
IS31LT3380
40V/1.2A LED DRIVER WITH SWITCH DIMMING
OCTOBER 2011
GENERAL DESCRIPTION
The IS31LT3380 is a continuous mode inductive
step-down converter, designed for driving a single LED or
multiple series connected LEDs efficiently from a voltage
source higher than the LED voltage. The chip operates
from an input voltage between 8.5V and 40V and
provides an output current up to 1.2A.
The IS31LT3380 includes a high-side output current
sensing circuit, which uses an external resistor to set the
nominal average output current. The IS31LT3380
includes an integrated output switch which has a very low
conducting impedance to ensure high system efficiency.
The IS31LT3380 has switch dimming function. The chip
detects external switch action to adjust output current,
allowing for dimming functionality to be achieved without
changing the original lighting system circuitry.
The switch dimming is implemented in either two-level
mode or three-level mode. The output current of every
level and the total number of levels are customer
selected by setting the corresponding input conditions of
DIM1 and DIM2 pin.
The output current is set at the initial value the first time
that power is supplied to the chip. After the initial power
up sequence, the chip adjusts the output current
according to the external switch action. After the lowest
current level, the current cycles back to the initial value if
more switch action is detected. If the power is switched
off for longer than 2 seconds, the device will return to it’s
initial state, and the output current will be set to the initial
value at the next time that power is applied.
FEATURES
Multi-modes switch dimming
Up to 1.2A output current
High efficiency (up to 98%)
Wide input voltage range: 8.5V to 40V
Internal 40V power switch
Simple low parts count
Typical 5% output current accuracy
Up to 1MHz switching frequency
Inherent LED open-circuit/short-circuit protection
Thermal shutdown protection circuitry
SOP8 package
APPLICATIONS
MR16, MR11 LED spotlight
LED street lighting
PAR LED bulb
Other LED lighting
http://www.DataSheet4U.net/
Copyright © 2011 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any 
time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are 
advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products. 
Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the 
product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not 
authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that: 
a.) the risk of injury or damage has been minimized; 
b.) the user assume all such risks; and 
c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 09/01/2011
1
datasheet pdf - http://www.DataSheet4U.net/




 IS31LT3380
IS31LT3380
APPLICATION CIRCUIT
Figure 1-A
http://www.DataSheet
Figure 1-B
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 09/01/2011
2
dat




 IS31LT3380
IS31LT3380
PIN CONFIGURATIONS
Package
SOP-8
Pin Configurations
PIN DESCRIPTION
Pin Name NO. Description
VIN
1
Input voltage (8.5V to 40V). Decouple to ground with 0.1μF X7R ceramic capacitor close to device. While
using the switch dimming function, connect a 220Uf or higher capacitor close the device.
ISENSE
DIM1
2 Connect resistor RS from this pin to VIN to define nominal average output current IOUTnom =0.1/RS
Set the current-levels number of and current ratio of each level of switch dimming function as below:
6 DIM1=“floating” DIM2=“floating”not dimming
DIM1=“floating” DIM2=“GND”three-levels100%---50%---20%
DIM2
5 DIM1=“GND” DIM2=“floating”three-levels100%---60%---30%
http://www.DataSheet4U.net/
DIM1=“GND” DIM2=“GND”two-levels100%---30%
GND
7 Ground (0V)
LX 8 Drain of power switch
NC 3,4 Not connect. Float required
ORDERING INFORMATION
Industrial Range: -40°C to 105°C
Order Number
Package
IS31LT3380-GRLS3-TR
SOP-8, Lead-free
QTY/Reel
2500
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 09/01/2011
3
datasheet pdf - http://www.DataSheet4U.net/



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